Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第11期    总第80期    2005年11月

[PDF全文下载]        

    

文章编号: 1004-0609(2005)11-1874-07
小冲杆试验法评价大块非晶合金的超塑性性能
张志豪, 谢建新

(北京科技大学 材料科学与工程学院, 北京 100083)

摘 要:  采用小冲杆试验法(SPT)研究了大块非晶合金(Zr41.2Ti13.8Cu12.5Ni10Be22.5)在不同温度和不同压头速度下的变形行为, 通过SPT载荷—位移曲线结合理论分析, 确定大块非晶(BMG)材料超塑性本构关系。 结果表明, BMG材料的SPT载荷—位移曲线对压头速度和实验温度的敏感性较高, 而SPT载荷—位移曲线的形状与材料的应变速率敏感系数、 粘度、 压头速度等因素有关。 在应变速率敏感系数和压头速度固定的条件下, SPT最大破裂载荷与粘度成正比; 最大破裂位移仅随应变速率敏感系数的增大而增大, 而与压头速度和粘度的大小无关。 获得了Zr41.25Ti13.75Ni10Cu12.5Be22.5 BMG应变速率敏感系数和表观粘度, 确定了该合金的超塑性本构关系。

 

关键字:  小冲杆试验; 大块非晶合金; 超塑性; 本构关系

Super-plasticity of bulk metallic glass evaluated by small punch test
ZHANG Zhi-hao, XIE Jian-xin

School of Materials Science and Engineering, 
University of Science and Technology Beijing, Beijing 100083

Abstract: The deforming behaviors of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass(BMG) under different temperatures and punch velocities were investigated by the small punch test. Based on SPT load—displacement curves and combined with theoretical analysis, a method for determining super-plastic constitutive relations of BMG was proposed. The results show that the SPT load—displacement curves of BMG are very sensitive to punch velocity and test temperature, and the shape of SPT load—displacement curves is controlled by strain rate sensitivity, viscosity and punch velocity etc. When the strain rate sensitivity and punch velocity are certain, maximal crack loads of SPT load—displacement curves are proportional to viscosities. Maximal crack displacement increases with the increase of strain rate sensitivity, and is independent on punch velocity and viscosity. The strain rate sensitivities and viscosities of Zr41.2Ti13.8Cu12.5Ni10Be22.5 BMG under different test conditions are obtained, and the super-plastic constitutive relations of the alloy are determined.

 

Key words: small punch test; bulk metallic glass; super-plasticity; constitutive relation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com